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T: Fachverband Teilchenphysik

T 3: Higgs I

T 3.7: Talk

Monday, March 19, 2018, 17:30–17:45, Philo-HS3

Measurement of the H → τ τ coupling exploiting tau lepton decay mode classification in the semi-leptonic final state at ATLAS — Philip Bechtle, Klaus Desch, Christian Grefe, •Lara Schildgen, and Peter Wagner — Physikalisches Institut, Universität Bonn

The decay of the Higgs boson into fermions plays an important role to gain a deeper understanding of the coupling properties of the Higgs. Because of the distinct signatures of the decaying tau leptons, the decay of the Higgs into a tau lepton pair is a unique channel to measure the Higgs coupling to fermions and is the first fermionic channel which gave a significance exceeding 5 σ in combined measurements of ATLAS and CMS.

Due to its short lifetime, the tau lepton decays before reaching the detectors and is therefore reconstructed by its decay products. The reconstruction algorithm for hadronic taus used in ATLAS has been improved and extended for run-2. In particular, it allows identification of different hadronic tau decay modes. In this talk we will discuss how this information can be used to improve the measurement of the decay of Higgs bosons into tau leptons using proton-proton collision data collected with the ATLAS detector at a center-of-mass energy of 13 TeV. We will focus on the semi-leptonic final state where only one of the two taus decays hadronically.